Dispatching more troops to Afghanistan would be a monumental bet and probably a bad one, most likely a waste of lives and resources that might simply empower the Taliban. In particular, one of the most compelling arguments against more troops rests on this stunning trade-off: For the cost of a single additional soldier stationed in Afghanistan for one year, we could build roughly 20 schools there.
It’s hard to do the calculation precisely, but for the cost of 40,000 troops over a few years — well, we could just about turn every Afghan into a Ph.D.
What's the old Heinlein saying?
Never try to teach a Pashtun tribesman to be a Ph.D. It wastes your time and it annoys the Pashtun tribesman.